<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <!-- 生产环境中不建议使用 -->
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>

</body>
<script type="text/babel">

    class Parent extends React.Component{
        constructor(){
            super()
            this.state={
                msg:'我是父组件',
                name:'我是父组件的名字'
            }
        }

        show(){
            this.setState({
                msg:'改变父组件的msg'
            })
        }

        render(){

            return (<div>
                        <strong onClick={this.show.bind(this)}>我是父組件 => {this.state.msg}</strong>
                        <Child setMsg={this.state.name}/>
                        <Child setMsg={this.state.msg}/>
                    </div>)
        }
    }

    class Child extends React.Component{
        constructor(){
            super()
            this.state = {
                msg:''
            }
        }

        componentWillMount(){
            this.setState({
                msg: this.props.setMsg
            })
        }

        render(){
            return (
                    <h1>我是子组件 => {this.props.setMsg}</h1>
                    )
        }
    }


    ReactDOM.render(<Parent/>,app)
    
</script>

</html>